 There are also believed to be the first successful tribe to move out of Africa.Any form of evidence on the Jarawas—social, cultural, historical, archaeological, linguistic, phenotypic, and genetic—support the conclusion that the Andaman Islanders have been isolated for a substantial period of time, which suggests why they have been able to survive despite modernization.The Jarawas are one of the three surviving tribes in the area, the other two being Sentinelese and Onge.